(138d) Co? Upcycling Via Mineralization of a Carbonate-Based Construction Material – Processing-Property Relationships of Co?Ncrete™
AIChE Annual Meeting
2017
2017 Annual Meeting
Topical Conference: Advances in Fossil Energy R&D
CO2 Use and Reuse
Monday, October 30, 2017 - 1:36pm to 1:58pm
As a critical step in this direction, we investigate the relationships between the composition of COâNCRETE⢠formulations, their processing conditions (e.g., COâ pressure/concentration, reaction time/temperature), and their mechanical properties in the hardened state (e.g., compressive strength). First, relationships between the extent of CO2 mineralization reaction as characterized via thermogravimetric analysis (TGA), and microstructural changes (e.g., porosity reduction) of model slurry-based hydrated lime specimens are evaluated. The COâ mineralization reaction is observed to manifest in an approximately 10 MPa improvement in compressive strength, depending on reaction extent (i.e., CO2 uptake). Next, the influence of reaction temperature on the rate of COâ mineralization, and the compressive strength of the resulting COâNCRETE⢠specimens is examined. Finally, supplementary strength-enhancing additives (e.g., calcium sulfoaluminate cement, polymeric adhesives) are evaluated for their ability to augment the compressive strength afforded by carbonation, with efficiency described in terms of the embodied CO2 footprint (i.e., MPa/kg CO2e) of the Ca(OH)2-binder composite. The outcomes indicate that the CO2 uptake/strength gain that accompanies carbonation may be exploited synergistically with properly selection/dosage of supplementary binders, to produce CO2-efficient alternative binder systems with performance equivalent to that of portland cement concrete.
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